Went thru same deal here, when roofers finished my new roof.. My neighbor bought one, so I used to to be extra sure after roofers finished..My roofers had a broom style one they went around the landscape with when they were done with my roof, and I was amazed how well it worked.
Yes they do. Wow near 4 lbs. I only found a small amount, barely 1/2 a handful. But certainly enough to give my mower flats..And boy the roofers leave a lot tacks behind. I pick-up nearly 4 lbs and that after they did the magnet sweep. I was not happy to step on them bare foot either.
The front tires on a zero turn do little for softening the ride. The rear tire are more involved for dampening. I have run flat solid filled tires on my Scag zero turn and they work great along with a good suspension seat. No flats to ever worry about.I ordered the Carlisle 4 ply tires and and a set of mounting tools. I may as well get used to changing tires.
It's rare I pick up nails now. My biggest threat is from brush that's cut to the wrong height. I'm in a constant battle with encroaching nature.